The environment greatly influences acquirement of the behavior on the artificial life creature (AC) and artifact object (AO). However, the conventional studies like Karl Sims' ones have not accurately considered in an environmental influence. Instead, these influences are considered by replacing them into a simple environment. In this study, we accurately model the under-water environmental influence. And we propose a simulation method for artificial creature swimming in consideration of buoyancy and water drags as a virtual water environment. As a result of simulation, we verify that it is possible for AC and AO to acquire swimming behavior in the under-water environment. Additionally we show the analysis of the acquired swimming behavior.
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